Grandfathers' Watches- advice appreciated

Hi- this is my first post on the forum thanks for having me.
I recently came across these two watches from the late 60s/early 70s at my mothers house. They belonged to my maternal and paternal grandfathers! As you can see from the photographs they are very similar models and the gold one (paternal grandfather's) was the proverbial "gold watch" for 44 years as a journalist in 1971.

I have resolved to do a gentle restoration on these watches and wear them. They won't be sold. I am planning on doing this myself as I'm quite mechanically minded and a microsurgeon by trade. I have bought some tools and an ETA 6497 calibre to learn on.

I would appreciate any thoughts on restoring or information on these models- they are ref 166.070 and 166.041 respectively, both with calibre 565. Some specific questions I have at this stage are;

1. Neither of the crystals looks original- I think there is supposed to be an omega symbol in the centre? (is this a "signed" crystal?). Also I believe there might supposed to be a gold ring on the inside of the crystal which is missing? Also, one of the two has a magnifier over the date which I am uncertain was original. Should I source a new omega crystal?

2. the crowns (especially on the gold watch) are very tarnished and perhaps would be better replaced? any thoughts?

3. Inside - the seals are completely perished and I guess will need replacing, i presume some generic seal is acceptable. In terms of mechanicals, should I assume that the mainsprings will benefit from being replaced and just buy new ones.

I realise that there may be a lot of opinions on patina as well. I appreciated all opinions, but to specify my personal goals- I would like them cleaned up and lightly restored looking good for their age.

Thanks in advance!

First off, welcome and congrats on having two cool Geneves.

The 565 is one of the many accurate, beautiful and reliable workhorse movements omega produced in the 50's and 60's. Having a pair of omegas that were both grandfather's watches is a wonderful heritage. shouldn't be particularly hard to work on, but as you can appreciate just having a dissection kit and a curved needle doesn't make me a surgeon. def practice a lot on your "cadaver" movement. 😉

Both look to be in pretty good shape. the crystals should be hesalite, a polishable type of plexiglass. i don't believe all omegas had the Ω symbol in them. replacing them isn't a big deal, but i'd give a good buff a try first. (e.g. )

i'm not a geneve expert, so idk on the magnifying cyclops, but if it's what my grandfather had... i'd keep it.
careful on too much case "brushing" it can be a slippery slope, they both look pretty good as is. a polish to the crystal and a couple of new straps and they will look spiff!

exciting to get them back in action and on the wrist.

congrats again.

I agree with everything said above. Those are two sweet heirlooms you have there. However I would play it safe and have them professionally serviced since they have family provenance. I'm also a do it yourselfer, but my duties, which I stick to on my own watches I collect, is to polish crystals and clean up the cases. I also work on bracelets if they need repair.
You can always pick up some el-cheapos to repair or service to get your feet wet, and prepare yourself for the next service these two heirlooms might need down the road 👍